Multi-unit LRM module server and display switching control method thereof

Abstract

The invention discloses a multi-unit LRM module server and a display switching control method thereof, and relates to the technical field of display switching of multi-unit LRM module servers, the multi-unit LRM module server comprises a case module, various function modules, a fan module and a vibration reduction frame; the case module is used for bearing each functional module, comprises a power supply module, a calculation module, an exchange module and a management module, and provides a mounting slot position; the case module is provided with a plurality of HDMI + USB interfaces; through a mode of connecting a plurality of domestic four-path display switching control chips in parallel, HDMI and USB signals of each calculation module are transmitted to any HDMI + USB interface, and visual operation can be realized through externally connecting a keyboard, a mouse and a display. According to the invention, the LRM module server which can be rapidly maintained and replaced and the real-time switching control of five paths of HDMI and USB signals are realized.

Description

Technical Field

[0001] The present invention relates to the technical field of display switching for multi-unit LRM module servers, and more specifically to a multi-unit LRM module server and its display switching control method. Background Art

[0002] With the development of avionics equipment towards high density and integration, the architecture of LRM modular servers has emerged. LRM (line replaceable modular) is also called field replaceable module, which has many advantages such as convenient use and maintenance, strong operability, small size, and high computing performance. Multiple computing LRM modules supplemented with power modules, switching modules, management modules and their mounting racks can form a multi-unit LRM module server with complete functions and powerful data operation and processing capabilities.

[0003] Compared with traditional multi-channel servers, multi-unit LRM module servers have the following advantages:

[0004] 1) It has relatively standard sizes and interfaces, and an independent installation and fastening method, making installation and replacement simple and fast;

[0005] 2) The heat dissipation components, LRM modules, chassis components, etc. adopt modular design, which is convenient for equipment management;

[0006] 3) It has a vibration damping frame device with vibration isolators, which can cope with complex vibration and shock environments, especially in airborne and vehicle-mounted use scenarios;

[0007] 4) Each LRM module and chassis component is independently sealed, with good structural and electrical shielding properties, and can cope with harsh use environments such as sand and dust, rain, and electromagnetic environments.

[0008] However, as a multi-unit server, it usually does not have a display screen and does not have a real-time display function. Therefore, each LRM unit is designed with HDMI+USB external output interfaces. To meet the need for real-time display and fast switching of display information of multiple computing units during use, it is necessary to achieve real-time switching of 5 HDMI and USB signals, while current domestic video switching chips only support 4-channel display switching. Summary of the Invention

[0009] The technical task of the present invention is to address the above deficiencies and provide a multi-unit LRM module server and its display switching control method, which realizes an LRM module server that can be quickly maintained and replaced and real-time switching control of 5 HDMI and USB signals.

[0010] The technical solution adopted by the present invention to solve its technical problems is:

[0011] A multi-unit LRM module server, comprising a chassis module, various functional modules, a fan module, and a shock absorber;

[0012] The chassis module is used to carry various functional modules, including a power module, a computing module, a switching module, and a management module, and provides installation slots;

[0013] The chassis module has multiple HDMI + USB interfaces; by the way of parallel connection of multiple domestic 4-channel display switching control chips, the HDMI and USB signals of each computing module are transmitted to any HDMI + USB interface, and visual operation can be realized by connecting an external keyboard, mouse, and display.

[0014] Furthermore, the chassis module includes a chassis bottom plate, a chassis left side plate, a chassis right side plate, a chassis back panel, a chassis rear panel, and a backplane;

[0015] The backplane is installed at the rear of the chassis module, and the interconnection of various functional modules is realized through a dedicated LRM connector.

[0016] Furthermore, a space is reserved at the bottom of the chassis module for installing the fan module. The fan module installs multiple axial fans and adopts a air duct form of bottom air intake and top air outlet to provide cooling air flow for various functional modules.

[0017] The combination of the chassis module and the fan module is installed on the upper part of the shock absorber to achieve the overall anti-vibration and shock performance.

[0018] Furthermore, the fan module adopts a pluggable design, and the interconnection between the fan module and the chassis module is realized through a dedicated connector;

[0019] A handle for plugging and unplugging is designed at the front of the fan module, and the handle is foldable and can be folded and retracted into the front panel of the fan module when not in use for plugging and unplugging;

[0020] The shock absorber includes a shock-absorbing bottom plate and vibration isolators.

[0021] Furthermore, the power module includes a heat dissipation housing, a cover plate, a front panel, a power board, and a handle,

[0022] Among them, a handle for module plugging and unplugging is designed on the front panel, and the handle is foldable and can be folded and retracted into the front panel of the power module when not in use for plugging and unplugging;

[0023] Indicator lights are designed on the front panel of the power module to indicate the working state of the power module;

[0024] A wedge-shaped installation slot is designed at the lower part of the front panel of the power module for installing a pressing block to fasten the power module.

[0025] Furthermore, the computing module includes a heat dissipation housing, a cover plate, a front panel, a computing main board, and a handle,

[0026] Among them, the front panel is designed with a handle for module plugging and unplugging. The handle is foldable and can be folded and retracted into the front panel of the computing module when not in use for plugging and unplugging.

[0027] The front panel of the computing module is designed with a switch knob for manually controlling the power on and off of the computing module.

[0028] The front panel of the computing module is designed with a aviation plug interface for debugging the computing module.

[0029] The front panel of the computing module is designed with an indicator light for prompting the working status of the computing module and displaying alarm information.

[0030] The lower part of the front panel of the computing module is designed with a wedge-shaped installation groove for installing a pressing block to fasten the computing module.

[0031] Furthermore, the switching module includes a heat dissipation housing, a cover plate, a front panel, a switching board, and a handle.

[0032] Among them, the front panel is designed with a handle for module plugging and unplugging. The handle is foldable and can be folded and retracted into the front panel of the switching module when not in use for plugging and unplugging.

[0033] The front panel of the switching module is designed with an indicator light for prompting the working status of the switching module, the status of each network interface, and displaying alarm information.

[0034] The lower part of the front panel of the switching module is designed with a wedge-shaped installation groove for installing a pressing block to fasten the switching module.

[0035] Furthermore, the management module includes a heat dissipation housing, a cover plate, a front panel, a computing main board, and a handle.

[0036] Among them, the front panel is designed with a handle for module plugging and unplugging. The handle is foldable and can be folded and retracted into the front panel of the management module when not in use for plugging and unplugging.

[0037] The front panel of the management module is designed with a switch knob for manually controlling the power on and off of the management module.

[0038] The front panel of the management module is designed with a aviation plug interface for debugging the management module.

[0039] The front panel of the management module is designed with an indicator light for prompting the working status of the management module and displaying alarm information.

[0040] The lower part of the front panel of the management module is designed with a wedge-shaped installation groove for installing a pressing block to fasten the management module.

[0041] Furthermore, the rear part of the chassis module is designed with a power input interface, a grounding post, and multiple HDMI + USB interfaces.

[0042] The power input interface is used to provide power input for the whole machine, and its input mode can be DC or AC;

[0043] The grounding post is connected to the ground through a grounding wire to achieve grounding protection;

[0044] The number of HDMI + USB interfaces is the same as the number of installed function modules. Each HDMI + USB interface is defaultly corresponding to one computing module, but it can be switched to any computing module through the display switching method.

[0045] The present invention also claims to protect a method for controlling display switching of a multi-unit LRM module server. Based on the above multi-unit LRM module server, 5-way video switching is achieved by using a parallel connection method of 3 four-way display switching chips. The specific implementation method is as follows:

[0046] The 5-way HDMI + USB IN signals come from 5 computing modules respectively. Among them, 4 signals are connected to display switching chip 1, and the 5th signal is connected to display switching chip 2;

[0047] Among the 4 HDMI + USB signals connected to display switching chip 1, 3 signals are connected to display switching chip 2, and the other 1 signal is connected to display switching chip 3;

[0048] Among the 4 HDMI + USB signals connected to display switching chip 2, 3 signals are connected to display switching chip 3, and the other signal is directly connected to the external HDMI + USB interface;

[0049] The 4 HDMI + USB signals connected to display switching chip 3 are directly connected to the other 4 external HDMI + USB interfaces.

[0050] Compared with the prior art, a multi-unit LRM module server and its display switching control method of the present invention have the following beneficial effects:

[0051] The present invention aims at the multi-unit LRM module server, and realizes multi-unit interconnection by configuring a power module, a switching module, a management module and multiple computing modules;

[0052] Through the LRM modular layout, the quick plugging and maintenance of each module are realized;

[0053] Through the design of an independent fan module, a flexible configuration of the heat dissipation environment based on the module power consumption is realized;

[0054] By configuring a vibration damping frame assembly with vibration isolators, good anti-vibration and shock performance is achieved;

[0055] By adopting a parallel connection scheme of multiple four-way display switching control chips, the domesticated 5-way video display switching control is realized. Description of the Drawings

[0056] Figure 1 is a schematic diagram of the multi-unit LRM module server chassis module provided by an embodiment of the present invention;

[0057] Figure 2 is a schematic diagram of the entire multi-unit LRM module server provided by an embodiment of the present invention;

[0058] Figure 3 is a schematic diagram of the fan module provided by an embodiment of the present invention;

[0059] Figure 4 is a schematic diagram of the vibration damping frame provided by an embodiment of the present invention;

[0060] Figure 5 is a schematic diagram of the power module provided by an embodiment of the present invention;

[0061] Figure 6 is a schematic diagram of the computing module provided by an embodiment of the present invention;

[0062] Figure 7 is a schematic diagram of the switching module provided by an embodiment of the present invention;

[0063] Figure 8 is a schematic diagram of the management module provided by an embodiment of the present invention;

[0064] Figure 9 is a schematic diagram of the rear panel interface of the multi-unit LRM module server provided by an embodiment of the present invention;

[0065] Figure 10 is a matrix block diagram of the display switching control scheme provided by an embodiment of the present invention.

[0066] In the figure: 1, chassis bottom plate; 2, left chassis side plate; 3, right chassis side plate; 4, chassis back panel; 5, chassis rear panel; 6, backplane; 7, fan module; 8, vibration damping frame; 9, power module; 10, computing module; 11, switching module; 12, management module; 13, special connector; 14, fan module handle; 15, axial flow fan; 16, vibration damping bottom plate; 17, vibration isolator; 18, power input interface; 19, grounding post; 20, HDMI + USB interface.

[0067] 9-1, power module heat dissipation housing; 9-2, power module cover; 9-3, power module front panel; 9-4, power board; 9-5, power module handle; 9-6, power module indicator light; 9-7, power module installation slot.

[0068] 10-1, Heat dissipation housing of the computing module; 10-2, Cover plate of the computing module; 10-3, Front panel of the computing module; 10-4, Computing mainboard; 10-5, Handle of the computing module; 10-6, Switch knob of the computing module; 10-7, Aviation plug interface of the computing module; 10-8, Indicator light of the computing module; 10-9, Installation slot of the computing module.

[0069] 11-1, Heat dissipation housing of the switching module; 11--2, Cover plate of the switching module; 11-3, Front panel of the switching module; 11-4, Switching board; 11-5, Handle of the switching module; 11-6, Indicator light of the switching module; 11-7, Installation slot of the switching module.

[0070] 12-1, Heat dissipation housing of the management module; 12-2, Cover plate of the management module; 12-3, Front panel of the management module; 12-4, Management mainboard; 12-5, Handle of the management module; 12-6, Switch knob of the management module; 12-7, Aviation plug interface of the management module; 12-8, Indicator light of the management module; 12-9, Installation slot of the management module. Detailed implementation manners

[0071] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0072] In view of the pain points in the use and maintenance of multi-channel servers and the lack of domestic chips in multi-channel video display switching technology, the embodiment of the present invention provides a multi-unit LRM module server, including: a chassis bottom plate 1, a chassis left side plate 2, a chassis right side plate 3, a chassis back panel 4, a chassis rear panel 5, a backplane 6, a fan module 7, a shock absorber 8, a power module 9, a computing module 10, a switching module 11, a management module 12, etc.

[0073] As Figure 1 , Figure 2 shown, they are respectively the schematic diagram of the chassis module of the multi-unit LRM module server and the schematic diagram of the whole machine of the multi-unit LRM module server.

[0074] The chassis bottom plate 1, the chassis left side plate 2, the chassis right side plate 3, the chassis back panel 4, the chassis rear panel 5, and the backplane 6 together form a chassis module, which is used to carry various functional modules such as the power module 9, the computing module 10, the switching module 11, and the management module 12, and provide installation slots.

[0075] The backplane 6 is installed at the rear of the chassis module, and realizes the interconnection of each functional module through a dedicated LRM connector.

[0076] A space is reserved at the bottom of the chassis module for installing the fan module 7.

[0077] As Figure 3 shown, it is the schematic diagram of the fan module.

[0078] The fan module 7 adopts a pluggable design and is interconnected with the chassis module through a dedicated connector 13. A handle 14 for plugging and unplugging is designed at the front of the fan module 7, and the handle 14 is foldable and can be folded and retracted into the front panel of the fan module when not in use for plugging and unplugging.

[0079] The fan module 7 is equipped with multiple axial fans 15 and adopts an air duct form of lower air intake and upper air outlet to provide cooling air flow for each functional module.

[0080] As Figure 4 shown, it is a schematic diagram of the shock absorber 8.

[0081] The combination of the chassis module and the fan module 7 is installed on the upper part of the shock absorber 8 to achieve the overall anti-vibration and shock performance.

[0082] The shock absorber 8 is composed of a shock-absorbing bottom plate 16 and vibration isolators 17.

[0083] Each functional module mainly includes a power supply module 9, a computing module 10, a switching module 11, a management module 12, etc.

[0084] As Figure 5 shown, it is a schematic diagram of the power supply module 9.

[0085] Specifically, the power supply module 9 is composed of a heat dissipation housing 9-1, a cover plate 9-2, a front panel 9-3, a power supply board 9-4, a handle 9-5, etc. The front panel 9-3 is designed with a handle 9-5 for module plugging and unplugging, and the handle 9-5 is foldable and can be folded and retracted into the front panel 9-3 of the power supply module when not in use for plugging and unplugging.

[0086] The front panel 9-3 of the power supply module is designed with an indicator light 9-6 for indicating the working state of the power supply module 9.

[0087] The lower part of the front panel 9-3 of the power supply module is designed with a wedge-shaped installation groove 9-7 for installing a pressing block to fasten the power supply module 9.

[0088] As Figure 6 shown, it is a schematic diagram of the computing module 10.

[0089] Specifically, the computing module 10 is composed of a heat dissipation housing 10-1, a cover plate 10-2, a front panel 10-3, a computing main board 10-4, a handle 10-5, etc. The front panel 10-3 is designed with a handle 10-5 for module plugging and unplugging, and the handle 10-5 is foldable and can be folded and retracted into the front panel 10-3 of the computing module when not in use for plugging and unplugging.

[0090] The front panel 10-3 of the computing module is designed with a switch knob 10-6 for manually controlling the power on and off of the computing module 10.

[0091] The front panel 10-3 of the computing module is designed with a D-sub connector 10-7 for debugging the computing module 10.

[0092] The front panel 10-3 of the computing module is designed with an indicator light 10-8 to indicate the working status of the computing module 10 and display warning messages.

[0093] The lower part of the front panel 10-3 of the computing module is designed with a wedge-shaped mounting groove 10-9 for installing a pressing block to fasten the computing module 10.

[0094] As Figure 7 shown in the schematic diagram of the switching module 11.

[0095] Specifically, the switching module 11 consists of a heat dissipation housing 11-1, a cover plate 11-2, a front panel 11-3, a switching board 11-4, a handle 11-5, etc. The front panel 11-3 is designed with a handle 11-5 for module plugging and unplugging. The handle 11-5 can be folded and retracted into the front panel 11-3 of the switching module when not in use.

[0096] The front panel 11-3 of the switching module is designed with an indicator light 11-6 to indicate the working status of the switching module 11, the status of each network interface, and display warning messages.

[0097] The lower part of the front panel 11-3 of the switching module is designed with a wedge-shaped mounting groove 11-7 for installing a pressing block to fasten the switching module 11.

[0098] As Figure 8 shown in the schematic diagram of the management module 12.

[0099] Specifically, the management module 12 consists of a heat dissipation housing 12-1, a cover plate 12-2, a front panel 12-3, a management main board 12-4, a handle 12-5, etc. The front panel 12-3 is designed with a handle 12-5 for module plugging and unplugging. The handle 12-5 can be folded and retracted into the front panel 12-3 of the management module when not in use.

[0100] The front panel 12-3 of the management module is designed with a switch knob 12-6 for manually controlling the power on and off of the management module 12.

[0101] The front panel 12-3 of the management module is designed with a D-sub connector 12-7 for debugging the management module 12.

[0102] The front panel 12-3 of the management module is designed with an indicator light 12-8 to indicate the working status of the management module 12 and display warning messages.

[0103] A wedge-shaped mounting groove 12-9 is designed at the lower part of the front panel 12-3 of the management module for installing a pressing block to fasten the management module 12.

[0104] As Figure 9 shown, it is a schematic diagram of the interface on the rear panel of a multi-unit LRM module server.

[0105] A power input interface 18, a grounding post 19, and multiple HDMI+USB interfaces 20 are designed at the rear of the chassis module.

[0106] Specifically, the power input interface 18 is used to provide power input to the whole machine, and its input method can be DC or AC.

[0107] The grounding post 19 is connected to the ground through a grounding wire to achieve grounding protection.

[0108] The number of the HDMI+USB interfaces 20 is the same as the number of the installed function modules. Each HDMI+USB interface 20 is defaultly corresponding to one path of the computing module 10, but it can be switched to any path of the computing module 10 by means of display switching.

[0109] By means of parallel connection of multiple domestic 4-way display switching control chips, the HDMI and USB signals of each computing module 10 are transmitted to any HDMI+USB interface. Through an external keyboard, mouse and display, visual operation can be realized.

[0110] The embodiment of the present invention also provides a method for controlling display switching of a multi-unit LRM module server. Based on the multi-unit LRM module server described in the above embodiment, 5-way video switching is realized by means of parallel connection of 3 domestic 4-way display switching chips. As Figure 10 shown, it is a matrix block diagram of the display switching control scheme described in this method. The specific implementation method is as follows:

[0111] The 5-way HDMI+USB IN signals come from 5 computing modules respectively. Among them, 4 paths are connected to the display switching chip 1, and the 5th path is connected to the display switching chip 2;

[0112] Among the 4 paths of HDMI+USB signals connected to the display switching chip 1, 3 paths are connected to the display switching chip 2, and the other 1 path is connected to the display switching chip 3;

[0113] Among the 4 paths of HDMI+USB signals connected to the display switching chip 2, 3 paths are connected to the display switching chip 3, and the other path is directly connected to the external HDMI+USB interface;

[0114] The 4 paths of HDMI+USB signals connected to the display switching chip 3 are directly connected to the other 4 external HDMI+USB interfaces.

[0115] Through the above solution, it is possible to transmit the HDMI and USB signals of each computing module 10 to any HDMI + USB interface. By connecting an external keyboard, mouse, and monitor, visual operation can be achieved. This solution overcomes the bottleneck of the lack of domestic 5-way display switching chips and realizes the free switching of 5-way display signals.

[0116] In summary, this multi-unit LRM module server realizes multi-unit interconnection by configuring a power module, a switching module, a management module, and multiple computing modules; realizes the quick plugging and unplugging and maintenance of each module through the LRM modular layout; realizes the flexible configuration of the heat dissipation environment based on the module power consumption through the design of an independent fan module; realizes good anti-vibration and shock performance by configuring a vibration damping frame assembly with vibration isolators; and realizes the domestic 5-way video display switching control by adopting the solution of paralleling multiple 4-way display switching control chips.

[0117] Through a similar solution as above, in the case of cascading a combination of multiple display switching chips, more than 5-way display switching can be achieved.

[0118] The technical principle of the present invention has been specifically described above in combination with the embodiments. These descriptions are only for explaining the principle of the present invention and are not limited to the above embodiments. Based on the disclosed embodiments, different technical solutions achieved by those skilled in the art through arbitrarily combining different technical features will fall within the protection scope of the present invention.

Claims

1. A multi-unit LRM module server, characterized in that It includes a chassis module, various functional modules, a fan module and a shock absorber frame; The chassis module is used to carry various functional modules, including a power module, a computing module, a switching module, and a management module, and provides installation slots; The chassis module has multiple HDMI + USB interfaces; by means of parallel connection of multiple domestic 4-channel display switching control chips, the HDMI and USB signals of each computing module are transmitted to any HDMI + USB interface, and visual operation can be realized by connecting an external keyboard, mouse and display.

2. The multi-unit LRM module server according to claim 1, characterized in that The chassis module includes a chassis bottom plate, a chassis left side plate, a chassis right side plate, a chassis back panel, a chassis rear panel, and a backplane; The backplane is installed at the rear of the chassis module, and the interconnection of various functional modules is realized through a dedicated LRM connector.

3. The multi-unit LRM module server according to claim 1, characterized in that A space is reserved at the bottom of the chassis module for installing the fan module. The fan module installs multiple axial fans and adopts a air duct form of bottom air intake and top air outlet to provide cooling air flow for various functional modules. The combination of the chassis module and the fan module is installed on the upper part of the shock absorber frame to achieve the overall anti-vibration and shock performance.

4. A multi-unit LRM module server according to claim 1 or 3, characterized in that, The fan module adopts a pluggable design, and the interconnection between the fan module and the chassis module is realized through a dedicated connector; A handle for plugging and unplugging is designed at the front of the fan module, and the handle is foldable. When not plugging and unplugging, the handle can be folded and retracted into the front panel of the fan module; The shock absorber frame includes a shock absorber bottom plate and vibration isolators.

5. A multi-unit LRM module server according to claim 1, characterized in that, The power module includes a heat dissipation housing, a cover plate, a front panel, a power board, and a handle, wherein, a handle for module plugging and unplugging is designed on the front panel, and the handle is foldable. When not plugging and unplugging, the handle can be folded and retracted into the front panel of the power module; Indicator lights are designed on the front panel of the power module to indicate the working state of the power module; A wedge-shaped installation groove is designed at the lower part of the front panel of the power module for installing a pressing block to fasten the power module.

6. A multi-unit LRM module server according to claim 1, characterized in that, The computing module includes a heat dissipation housing, a cover plate, a front panel, a computing main board, and a handle, wherein, a handle for module plugging and unplugging is designed on the front panel, and the handle is foldable. When not plugging and unplugging, the handle can be folded and retracted into the front panel of the computing module; A switch knob is designed on the front panel of the computing module for manually controlling the power on and off of the computing module; A aviation plug interface is designed on the front panel of the computing module for debugging the computing module; Indicator lights are designed on the front panel of the computing module to indicate the working state of the computing module and display warning information; A wedge-shaped installation groove is designed at the lower part of the front panel of the computing module for installing a pressing block to fasten the computing module.

7. A multi-unit LRM module server according to claim 1, wherein, The switching module includes a heat dissipation housing, a cover plate, a front panel, a switching board, and a handle, wherein, a handle for module plugging and unplugging is designed on the front panel, and the handle is foldable. When not plugging and unplugging, the handle can be folded and retracted into the front panel of the switching module; Indicator lights are designed on the front panel of the switching module to indicate the working state of the switching module, the states of each network interface, and display warning information; A wedge-shaped installation groove is designed at the lower part of the front panel of the switching module for installing a pressing block to fasten the switching module.

8. A multi-unit LRM module server according to claim 1, characterized in that, The management module includes a heat dissipation housing, a cover plate, a front panel, a computing main board, and a handle, wherein, a handle for module plugging and unplugging is designed on the front panel, and the handle is foldable. When not plugging and unplugging, the handle can be folded and retracted into the front panel of the management module; The front panel of the management module is designed with a switch knob for manually controlling the power on and off of the management module; The front panel of the management module is designed with an aviation plug interface for debugging the management module; The front panel of the management module is designed with an indicator light to indicate the working status of the management module and display alarm information; A wedge-shaped mounting groove is designed at the lower part of the front panel of the management module for installing a pressure block to fasten the management module.

9. A multi-unit LRM module server according to claim 1 or 2, characterized in that, The rear of the chassis module is designed with a power input interface, a grounding column, and multiple HDMI+USB interfaces; The power input interface is used to provide power input to the whole machine, and its input mode can be direct current or alternating current; The grounding column is connected to the earth through a grounding wire to achieve grounding protection; The number of the HDMI+USB interfaces is the same as the number of installed functional modules. Each HDMI+USB interface corresponds to one computing module by default, but it can be switched to any computing module by display switching.

10. A method for controlling display switching of a multi-unit LRM module server, characterized in that, Based on the multi-unit LRM module server according to any one of claims 1 to 9, 5-way video switching is realized by connecting three 4-way display switching chips in parallel, and the specific implementation method is as follows: The 5 HDMI+USB IN signals come from 5 computing modules, 4 of which are connected to display switching chip 1, and the 5th is connected to display switching chip 2; Three of the four HDMI+USB signals connected to the display switching chip 1 are connected to the display switching chip 2, and the other one is connected to the display switching chip 3; Three of the four HDMI+USB signals connected to the display switching chip 2 are connected to the display switching chip 3, and the other one is directly connected to the external HDMI+USB interface; The 4 HDMI+USB signals connected to the display switching chip 3 are directly connected to the other 4 external HDMI+USB interfaces.

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